大鼠正畸牙齿移动过程中牙周组织超微结构的改变

目的：研究正畸牙齿移动过程中牙周组织超微结构的改变情况。方法：施加外力使大鼠上颌第一磨牙向近中移动后，处死大鼠制备第一磨牙标本，进行透射电镜观察。结果：大鼠受正畸力作用后，组织各种生理、病理反应更加明显，压力侧破骨细胞增多，线粒体、溶酶体增多，高尔基体发达，成纤维细胞排列紊乱、变性、萎缩甚至坏死。张力侧成骨细胞、成纤维细胞的胞浆内高尔基体、内质网丰富，分泌功能旺盛。结论：正畸力引起牙周组织细胞功能的旺盛，改建活跃。

The ultrastructural changes of periodontal tissues during orthodontic tooth movement in rats

AIM: To study the periodontic response of ultrastructure during orthodontic tooth movement.METHODS; This experiment was designed and completed by using of female rats under transmission electron microscope. RESULTS:The periodontium of rats was more easy to response to orthodontic forces, and the functions of osteo-clasts, osteoblasts and fibroblasts was more active. CONCLUSIONS:The forces may promote the remodeling of perio-dontal tissues, including bone formation on the tension side and resorption on the pressure side.